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首页> 外文期刊>The Progressive Fish-Culturist >Effects of rearing density and raceway conformation on growth, food conversion, and survival of juvenile spring chinook salmon
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Effects of rearing density and raceway conformation on growth, food conversion, and survival of juvenile spring chinook salmon

机译：饲养密度和水道构象对少年春努努鲑鱼生长，食物转化和存活的影响

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摘要

Four brood years of juvenile spring chinook salmon, Oncorhynchus tshawytscha, were reared in conventional and baffled raceways at various rearing densities and loads at Willamette Hatchery, Oregon. A period of rapid linear growth occurred from August to November, but there was little or no growth from November to March when the fish were released. Both fall and winter growth rates were inversely related to rearing density. Final weights and lengths were also inversely related to rearing density. Nosignificant relationship between load and any growth variable was observed. Fish reared at lower densities in conventional raceways tended to develop bimodal length distributions in winter and early spring. Fish reared in conventional raceways showed significantly larger growth rates and final lengths and weights than those reared in baffled raceways. Feed conversions and average delivery times for feed were significantly greater in baffled than in conventional raceways. No significant relationships were observed between either rearing density or load and condition factor, feed conversion, or mortality. Mortality was not significantly different between the 2 raceway types. When fish were transported to seawater for further rearing, there were no significant relationships between mortality in seawater and rearing density or load, but fish reared in baffled raceways had significantly higher mortality than those reared in conventional raceways.
机译：在俄勒冈州威拉米特孵化场以不同的饲养密度和负荷，在常规的和带挡板的水道中饲养了四只幼年的奇诺克鲑，Oncorhynchus tshawytscha。从八月到十一月出现了一个快速的线性增长期，但是从十一月到三月放鱼时几乎没有或没有增长。秋季和冬季的增长率均与饲养密度成反比。最终重量和长度也与饲养密度成反比。观察到负荷与任何生长变量之间无显着关系。在常规航道中以较低密度饲养的鱼在冬季和初春时倾向于出现双峰长度分布。与在折流道中养殖的鱼相比，在常规水道中养殖的鱼的生长速度，最终长度和重量明显更大。折流板中的饲料转化率和平均饲料交付时间显着大于常规水道。在饲养密度或负荷与条件因素，饲料转化率或死亡率之间未发现显着关系。两种滚道类型之间的死亡率无明显差异。当将鱼运到海水中进行进一步饲养时，海水死亡率与饲养密度或负荷之间没有显着关系，但是在挡板式水道中饲养的鱼的死亡率明显高于在常规水道中饲养的鱼。

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